A Laboratory Assessment of the Use of Borehole Pressure Transients to Measure the Permeability of Fractured Rock Masses PDF Download
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Author: C. B. Forster
Publisher:
ISBN:
Category : Rocks
Languages : en
Pages : 116
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Author: C. B. Forster
Publisher:
ISBN:
Category : Rocks
Languages : en
Pages : 116
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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A laboratory program is described that was designed (1) to evaluate the degree of correlation between permeability values determined from steady-state and transient tests on the same samples and (2) to determine the effects of packer compliance on pressure pulse tests performed on low permeability rocks. The basic theory of pressure pulse testing is reviewed and modifications are proposed that may account for packer compliance effects. The laboratory set-up simulates a full-scale field situation using standard field packers in a 76 mm steel pipe. Cylindrical samples 5 cm in diameter and 11 cm long can be subjected to hydrostatic confining pressure up to 34 MPa and pore pressures up to 10 MPa. Using this equipment, transient pressure pulse tests and stead-state flow tests have been performed on (1) two samples of Berea sandstone having conductivities of 6.1 x 10−5 cm/sec and 2.4 x 10−4 cm/sec. and (2) one sample of Stripa granite containing a single fracture parallel to the core axis. Flow through the fracture varied from 1.0 to 0.05 cm3/min when the confining pressure varied from about 3 MPa to 14 MPa for pressure differentials of 0.14 MPa. Transient tests on the porous media samples consistently gave lower permeability values than steady-state tests on the same samples. All samples showed distinct compliance effects that increased with decreasing permeability. The laboratory results demonstrated that transient tests are very sensitive to minor leaks in the test assembly and to temperature variations as slight as +- 0.05°C in the cavity fluid. Thus pressure-pulse borehole equipment must be carefully checked in full-scale test assemblies and must incorporate temperature measuring devices that can detect changes of +- 0.01°C.
Author: C. B. Forster
Publisher:
ISBN:
Category : Rocks
Languages : en
Pages : 97
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Author:
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ISBN:
Category :
Languages : en
Pages :
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A field experiment to evaluate the transient pressure pulse technique as a method of determining the in-situ hydraulic conductivity of low permeability fractured rock was made. The experiment attempted to define: the radius of influence of a pressure pulse-test in fractured rock and the correlation between pressure-pulse tests and steady-state flow tests performed in five boreholes drilled in fractured granite. Twenty-five test intervals, 2 to 3 m in length, were isolated in the boreholes, using air-inflated packers. During pressure pulse and steady-state tests, pressures were monitored in both the test and observation cavities. Rock-mass conductivities were calculated from steady-state test results and were found to range from less than 10−11 to 10−7 cm/sec. However, there was no consistent correlation between the steady-state conductivity and the pressure pulse decay characteristics of individual intervals. These conflicting test results can be attributed to the following factors: differences in volumes of rock affected by the test techniques; effects of equipment configuration and compliance; and complexity of the fracture network. Although the steady-state flow tests indicate that hydraulic connections exist between most of the test cavities, no pressure responses were noted in the observation cavities (located at least 0.3 m from the test cavities) during the pulse tests. This does not mean, however, that the pressure-pulse radius of influence is
Author: C.B. Forster
Publisher:
ISBN:
Category : Granite
Languages : en
Pages : 138
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Category : Radioactive waste disposal in the ground
Languages : en
Pages : 354
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Author: K. Fuenkajorn
Publisher: Springer Science & Business Media
ISBN: 9400915055
Category : Science
Languages : en
Pages : 339
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Book Description
Sealing of boreholes and underground excavations has not received much engineering attention until fairly recently. The growing awareness of and sensitivity to environmental concerns of the technical community as well as of the public at large has resulted in an increasing recognition of the fact that these geological penetrations may have an environmental impact. The issue of possible contamination resulting from migration along boreholes, adits, shafts or tunnels unquestionably has been raised most forcefully with in the context of nuclear waste disposal. Several nuclear waste disposal programs, notably the Civilian and the Defence programs of the US De partment of Energy, the US Nuclear Regulatory Commission and the Canadian and Swedish radioactive waste disposal programs have conducted major research efforts aimed at developing adequate seal designs for penet rations in host rock formations for high-level nuclear waste repositories. While a considerable data base has been gathered over the last two decades or so with regard to the performance of seals, most of the information is presented in research reports and widely scattered papers in journals and proceedings of conferences. Hence, the materials are not readily accessible to potential users such as designers, contractors or regulators who are not familiar with nuclear waste disposal programs.
Author: Parviz Montazer
Publisher:
ISBN:
Category : Crystalline rocks
Languages : en
Pages : 222
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Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 724
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Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1124
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